bleed/tubing issue

[dem1an]

i finally found some ball valves and instant fittings that i thought would make my installation more professional and convienent. here is the problem.

the ball valves are max tube o.d. of 3/8" with quick push fittings. i have dangerden block and rad that have barbs or tubes that are 3/8" o.d. the instant fittings lend themselves to a fimmer tube the barb softer tube.

would there be any adverse issues with changing tube type and firmness...eg polypropylene to polyethylene? and from 3/8 outter thru the bleed kit to 1/2 outter thru the rest?

[surlyjoe]

you shouldnt use the soft vinyl tubing in the push type quick connects ,they are made for hard polyethelene tubing only , however you can heat uup the hard tubing and slip it on the hose barbs while its soft

[dem1an]

actually you can use softer tubing with end reinforcements...as per the specs. in any case, i would probably just merge the two systems with a coupler (barb on one side and quick connect on the other).

i wasnt aware you could heat up polypropolene tubing for barb connections. does this form a reliable water tight connection??? sounds iffy. especially jumping from 3/8 o.d. tube to 3/8" barb.

what about the issue of changing sizes? is this a problem?